Fix rebuild generation reconciliation (Refs #155)

tests/unit/database-migrations.test.ts

@@ -291,3 +291,18 @@ it('adds provisioning report invalidation at version 14 without invalidating for
     upgraded.exec('DELETE FROM server_deployments');
     expect(revision()).toBeGreaterThan(completed);
 });
+
+it('adds the generation evidence boundary to a version 23 database without changing instance identity', async () => {
+    const { db, closeDb } = await import('../../src/lib/server/db/index.js');
+    const handle = db();
+    handle.exec(
+        "INSERT INTO native_instances(id,server,host_id,generation,library_id,image,port,created_at) VALUES('instance','s','host',2,'lib','image',1,'2026-10-14T00:00:00Z')"
+    );
+    handle.exec('ALTER TABLE native_instances DROP COLUMN generation_reconciled_at');
+    handle.pragma('user_version = 23');
+    closeDb();
+    expect(
+        db().prepare('SELECT id,generation,generation_reconciled_at FROM native_instances').get()
+    ).toEqual({ id: 'instance', generation: 2, generation_reconciled_at: null });
+    expect(db().pragma('foreign_key_check')).toEqual([]);
+});